Question 8

In the circuit below a battery of UNKNOWN emf and an internal resistance of 0,5 Ω is connected to two resistors of 4 Ω and 8 Ω each, and a resistor R of unknown resistance.
Ignore the resistance of the connecting wires.

8.1 The three external resistors are ohmic conductors.
Explain the meaning of the term ohmic conductor. (2)

8.2 When switch S is OPEN, voltmeter V1 reads 3,2 V.
Calculate the:
8.2.1 Current through the battery (3)

8.2.2 Emf of the battery (4)

8.3 When switch S is CLOSED, voltmeter V2 reads 8,8 V.
8.3.1 Calculate the resistance of resistor R. (5)

8.3.2 The battery becomes heated when voltmeter V2 is replaced by a connecting wire. Explain this observation. (3)

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